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//===- LineIterator.h - Iterator to read a text buffer's lines --*- C++ -*-===//
//
// The LLVM Compiler Infrastructure
//
// This file is distributed under the University of Illinois Open Source
// License. See LICENSE.TXT for details.
//
//===----------------------------------------------------------------------===//
#ifndef LLVM_SUPPORT_LINEITERATOR_H__
#define LLVM_SUPPORT_LINEITERATOR_H__
#include "llvm/ADT/StringRef.h"
#include "llvm/Support/DataTypes.h"
#include <iterator>
namespace llvm {
class MemoryBuffer;
/// \brief A forward iterator which reads non-blank text lines from a buffer.
///
/// This class provides a forward iterator interface for reading one line at
/// a time from a buffer. When default constructed the iterator will be the
/// "end" iterator.
///
/// The iterator also is aware of what line number it is currently processing
/// and can strip comment lines given the comment-starting character.
///
/// Note that this iterator requires the buffer to be nul terminated.
class line_iterator
: public std::iterator<std::forward_iterator_tag, StringRef> {
const MemoryBuffer *Buffer;
char CommentMarker;
unsigned LineNumber;
StringRef CurrentLine;
public:
/// \brief Default construct an "end" iterator.
line_iterator() : Buffer(nullptr) {}
/// \brief Construct a new iterator around some memory buffer.
explicit line_iterator(const MemoryBuffer &Buffer, char CommentMarker = '\0');
/// \brief Return true if we've reached EOF or are an "end" iterator.
bool is_at_eof() const { return !Buffer; }
/// \brief Return true if we're an "end" iterator or have reached EOF.
bool is_at_end() const { return is_at_eof(); }
/// \brief Return the current line number. May return any number at EOF.
int64_t line_number() const { return LineNumber; }
/// \brief Advance to the next (non-empty, non-comment) line.
line_iterator &operator++() {
advance();
return *this;
}
line_iterator operator++(int) {
line_iterator tmp(*this);
advance();
return tmp;
}
/// \brief Get the current line as a \c StringRef.
StringRef operator*() const { return CurrentLine; }
const StringRef *operator->() const { return &CurrentLine; }
friend bool operator==(const line_iterator &LHS, const line_iterator &RHS) {
return LHS.Buffer == RHS.Buffer &&
LHS.CurrentLine.begin() == RHS.CurrentLine.begin();
}
friend bool operator!=(const line_iterator &LHS, const line_iterator &RHS) {
return !(LHS == RHS);
}
private:
/// \brief Advance the iterator to the next line.
void advance();
};
}
#endif // LLVM_SUPPORT_LINEITERATOR_H__
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